I have a video you can watch where I show you these carpentry techniques. And if you prefer I also have pictures below with explanations.

Note that the video actually has some bonus projects - I daVinci some of these joints to make them even stronger and better.

Watch the video here:

Mortise and Tenon -

This is a strong connection that has a whole lot of different uses. You can make picture frames or assemble together pieces of cardboard to make larger pieces. Let's take a look.

Each piece is a sandwich of three pieces of cardboard. The mortise has a space in the middle and the tenon sticks out in the middle.

You apply glue and slide the tenon into the mortise.

This side view shows it assembled although I haven't applied glue.

Dado -

A dado is a great way to put together pieces of cardboard that you want to be at right angles to each other.

The bottom pieces needs to be a stack of at least two sheets of cardboard. The vertical piece can be single or more.

Glue together that vertical piece first. This way you know how thick it is and how thick you need to make the groove in the bottom piece.

Then glue together the bottom piece leaving a gap the width of your top piece.

You can either glue this piece together and then cut out the groove. Or you can cut up that top piece into two pieces and glue them on.

Rabbet -

This is a great technique for making corners that are clean, crisp and strong.

To make this joint the bottom piece needs to be at least two cardboard sheets thick. It can be more. I will show you.

Start by gluing together the top piece (If it is more than one thick). This way you know how thick to make the groove on the bottom one.

The bottom one is at least two thick and the top layer is cut away to the thickness of your top piece.

It is pretty much the same as a dado except that the groove is along the side.

And you glue these two bases pieces together leaving the groove to be the same width as the top piece.

And you glue the top piece into that groove.